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I built OpenCV from source along with opencv_contrib as well.

For some reason all my attempts to access the classes in lineDescriptor lead to a linker error.

All of these declarations throw a linker error

BinaryDescriptor bsd = BinaryDescriptor();
Ptr<BinaryDescriptor> bsd1 = BinaryDescriptor::createBinaryDescriptor();
Ptr<LSDDetector> lsd1 = LSDDetector::createLSDDetector();

I fully understand what the error means but I don't know why it is thrown in the first place.

I've looked around and tried different solutions; changing the compiler, verified linker flags and linked my libraries, but the error was still getting thrown.

#include <iostream>
#include "opencv2/opencv.hpp"
#include "opencv2/line_descriptor.hpp"

using namespace cv;
using namespace std;
using namespace line_descriptor;

void detectLines(Mat& original, Mat grey)
{
    Ptr<LineSegmentDetector> lsd = createLineSegmentDetector(2);

    vector<Vec4f> lines;

    lsd->detect(grey, lines);

    cout << "Detected " << lines.size() << endl;

    lsd->drawSegments(original, lines);

    // Linker problems galore
//  BinaryDescriptor bsd = BinaryDescriptor();
//  Ptr<BinaryDescriptor> bsd1 = BinaryDescriptor::createBinaryDescriptor();
//  Ptr<LSDDetector> lsd1 = LSDDetector::createLSDDetector();

}

These are my current linker flags

-lopencv_calib3d -lopencv_core -lopencv_features2d -lopencv_flann -lopencv_highgui -lopencv_imgcodecs -lopencv_imgproc -lopencv_ml -lopencv_objdetect -lopencv_photo -lopencv_shape -lopencv_stitching -lopencv_superres -lopencv_ts -lopencv_video -lopencv_videoio -lopencv_videostab

I personally feel like it has something to do with my flags but I am not sure of the flag that corresponds to the lineDescriptor. Any help will be greatly appreciated!